Headphone accessory



FIG. 1 is a front perspective view of a headphone accessory, showing ournew design in a use condition;

FIG. 2 is an enlarged front perspective view of a headphone accessory;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is an opposing side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines showing the environment in the Figures are forillustrative purposes only and form no part of the claimed design.

The ornamental design for a headphone accessory, as shown and described.